I found at least Buypass offering a gratis ACME product "Buypass Go SSL". They have roots which are deployed at least since Android 4.1, which covers way more A

I found at least Buypass offering a gratis ACME product "Buypass Go SSL". They have roots which are deployed at least since Android 4.1, which covers way more Android devices (according to the Android Studio statistics, >99%): https://android.googlesource.com/platform/libcore/+/android-4.1.1_r1/luni/src/main/files/cacerts/eb375c3e.0 https://android.googlesource.com/platform/libcore/+/android-... I'm not sure whether that particular root is being used for their Go SSL product. If so, Buypass might be a good alternative to migrate to. From what I read though, they do require an E-Mail address, so you've got to keep that in mind.